Build 76.0.141.0 canary build seems to no longer be logging into AAD profiles.
Verified that the "Sign in with AAD Account" flag is set to enabled. I toggled it off/on again just to validate.
The profile image/information simply shows "Profile 1" with no attached image.
Jumped back onto Dev build 75.0.131.0 and that is currently attaching to the correct AAD Account.
Not sure if this is a regression or ongoing change for sync but wanted to report it.
